Bring a Friend: Some sample sales will go so far as to confiscate phones before entering (we're looking at you, Mr. Louboutin), so having a buddy on hand, especially when mirrors are hard to come by, will serve you well.

And Make New Friends: This rule goes beyond the general "do unto others" credo. It's good karma to point others in the right direction, and if you're kind to the salesperson, they may lead you to those adorable printed blouses hidden in the back corner.